Related Clues:
- Century upon century
- Sits in a cellar, say
- Won't get any younger on the banks of 18 across
- ___ 10 and up (info on a game box)
- Extended period of time
- 100,000,000 decades
- Many millennia make one
- Found in Dagestan quite a while ago
- 2, 4, 6, 8, etc
- Frustrating waiting time, facetiously
- Very long period (US and technical spelling)
- Very long span
- We live in the Phanerozoic
- Fathomless time
- Accumulates birthdays